class: center, middle, inverse, title-slide # Humidity in Melbourne ### Yin Shan Ho, Yu Luo, Zoljargal Batsaikhan ### Monash University ### 2021-10-13 --- background-image: url(https://www.melbournegems.com/images/xmelbourne-weather.jpg.pagespeed.ic.UX-q8gxi4B.jpg) # The 'crazy' weather in Melbourne .footnote[Image credit: [melbournegems](https://www.melbournegems.com/melbourne-weather.html#sthash.yzWUj1YE.dpbs)] --- ##Introduction -- - [Humidity Check](https://humiditycheck.com/comfortable-humidity-level-outside) the relative humidity level outside is considered comfortable between 30% and 50%. -- - [Environmental Protection Agency](https://www.epa.gov/mold/mold-course-chapter-2) the relative humidity should be kept below 60 percent -- ## Questions -- - How does relative humidity in Melbourne change throughout the measured time? -- - When is it most uncomfortable to walk around the city (humidity below 30% or above 60%)? --- ## Data Description -- - The location.csv data is downloaded from [City of Melbourne- Microclimate-Sensor-locations](https://data.melbourne.vic.gov.au/Environment/Microclimate-Sensor-Locations/irqv-hjr4) -- - Contains the location and location description for each microclimate sensor device installed throughout the city. -- ## The locations of the sensor in Map
--- ## Summary of locations.csv <style type="text/css"> .pull-left { float: left; } .pull-right { width: 35%; } </style> -- <!-- --> -- - Data types: **Numeric**, **Character**, **Date** -- - **end_reading** all missing -- - 4th data missing in **last_data**. --- ## The data dictionary of locations.csv <div style="border: 1px solid #ddd; padding: 5px; overflow-x: scroll; width:100%; "><table class="table table-striped" style="font-size: 12px; margin-left: auto; margin-right: auto;"> <thead> <tr> <th style="text-align:left;color: white !important;background-color: #0C85E4 !important;text-align: center;"> Variables </th> <th style="text-align:left;color: white !important;background-color: #0C85E4 !important;text-align: center;"> Description </th> <th style="text-align:left;color: white !important;background-color: #0C85E4 !important;text-align: center;"> Data-type </th> </tr> </thead> <tbody> <tr> <td style="text-align:left;"> site_id </td> <td style="text-align:left;"> Unique location id referring to the location of sensor device (used to link the location of the sensor device to the Microclimate Sensor Readings dataset </td> <td style="text-align:left;"> Numeric </td> </tr> <tr> <td style="text-align:left;"> gateway_hub_id </td> <td style="text-align:left;"> Unique sensor device id. One sensor device will contain multiple microclimate sensors (used in combination with the site_id to link to the Microclimate Sensor Readings dataset </td> <td style="text-align:left;"> Character </td> </tr> <tr> <td style="text-align:left;"> description </td> <td style="text-align:left;"> Description of the location of the sensor device </td> <td style="text-align:left;"> Character </td> </tr> <tr> <td style="text-align:left;"> last_data </td> <td style="text-align:left;"> Date and time when the last data was sent from a sensor associated with the sensor device </td> <td style="text-align:left;"> Date </td> </tr> <tr> <td style="text-align:left;"> site_status </td> <td style="text-align:left;"> Indicates if the site is a historic location for the sensor device or currently in use. R = retired, the location is no longer in use. C = current, the present location of the sensor device </td> <td style="text-align:left;"> Character </td> </tr> <tr> <td style="text-align:left;"> start_reading </td> <td style="text-align:left;"> Date and time sensor device began transmitting data from this site </td> <td style="text-align:left;"> Date </td> </tr> <tr> <td style="text-align:left;"> longitude </td> <td style="text-align:left;"> Longitude of the site </td> <td style="text-align:left;"> Numeric </td> </tr> <tr> <td style="text-align:left;"> latitude </td> <td style="text-align:left;"> Latitude of the site </td> <td style="text-align:left;"> Numeric </td> </tr> <tr> <td style="text-align:left;"> location.type </td> <td style="text-align:left;"> Type of the location </td> <td style="text-align:left;"> Character </td> </tr> <tr> <td style="text-align:left;"> end_reading </td> <td style="text-align:left;"> Date and time sensor device stopped transmitting data from this site </td> <td style="text-align:left;"> Date </td> </tr> </tbody> </table></div> --- ## Summary of weather.csv <!-- --> -- - Downloaded from [City of Melbourne- Microclimate-Sensor-Readings](https://data.melbourne.vic.gov.au/Environment/Microclimate-Sensor-Readings/u4vh-84j8) -- - Contains environmental readings from microclimate sensors -- - Data dictionary is accessible [Here](https://data.melbourne.vic.gov.au/api/views/u4vh-84j8/files/a2a9a6e3-2d46-4469-8d04-3335306034d5?download=true&filename=MicroClimateSensors_Metadata_Attachment_DataDictionary.pdf) --- ## Count of the obseravations in weather.csv <style type="text/css"> .pull-left { width: 70%; } .pull-right { width: 30%; } </style> -- .pull-left[ <img src="grp_presentation_yluo_files/figure-html/obs-count-1.png" height="80%" /> ] -- .pull-right[ - The data is from 2021-05-27 to 2021-10-04. - Updated every 15 minutes - 4obs `\(\times\)` 24hr/day `\(=\)` 96obs/day - To determine microclimate changes ] --- class: inverse, middle, center <img src="https://static-int.testo.com/media/4c/fa/4655130c014a/Teaser-Unterseiten-2000x1500pix_master.jpg" style="width: 70%" /> # Analysis .footnote[Image credit: [testo](https://www.testo.com/en-AU/products/air-humidity-meter)] --- # Overall trend of the humidity in Melbourne -- <!-- --> -- - Huge variation of the Relative Humidity(RH) -- - Rising trend of RH before and after Winter -- - Downward trend of RH in Winter time (Mid Jun to Sep) --- # Humidity Change by Time of A Day .pull-left[ <img src="grp_presentation_yluo_files/figure-html/humidity-bysite-time-1.png" width="90%" /> ] -- .pull-right[ - Humidity changes throughout a day, all sites follow a similar **day pattern**. <br> - It is not uncomfortable to walk around **before about 9:00 to 12:00 and after about 18:00**. - Humidity change turning points/time **vary from site to site**. <br> ] --- # Humidity Change in Different Month .pull-left[
] -- .pull-right[ - Uncomfortable time tends to be **shorter from Jun to Sep (Winter)**. <br> - In same month, The length of uncomfortable time **varies from site to site.** ] --- # Closer to river, more humid? .pull-left[ <img src="grp_presentation_yluo_files/figure-html/humidity-bysite-1.png" width="90%" /> ] -- .pull-right[ - Red lines are **five sites closer to river**: 1007, 1010, 1011, 1014, 1009. <br> - It is not closer to water network, more humid. - Humidity is also **affected by many factors**: [river width](https://pubmed.ncbi.nlm.nih.gov/22720611/), [topography, land cover, and surface reflectivity](https://www.frontiersin.org/articles/10.3389/feart.2015.00010/full) and so on. ] --- # Acknowledgments and References Slides created via the R package [**xaringan**](https://github.com/yihui/xaringan). The R packages we used: [**tidyverse**](https://doi.org/10.21105/joss.01686), [**lubridate**](https://www.jstatsoft.org/v40/i03/), [**leaflet**](https://CRAN.R-project.org/package=leaflet), [**kableExtra**](https://CRAN.R-project.org/package=kableExtra), [**visdat**](http://dx.doi.org/10.21105/joss.00355). Data is downloaded from: <br> [City of Melbourne-Microclimate Sensor Locations](https://data.melbourne.vic.gov.au/Environment/Microclimate-Sensor-Locations/irqv-hjr4), <br> [City of Melbourne-Microclimate-Sensor-Readings](https://data.melbourne.vic.gov.au/Environment/Microclimate-Sensor-Readings/u4vh-84j8) Other references: <br> [Environmental Protection Agency-Lesson 3: Humidity](https://www.epa.gov/mold/mold-course-chapter-2), <br> [Humidity Check-What Is a Comfortable Humidity Level Outside?](https://humiditycheck.com/comfortable-humidity-level-outside), <br> [The Effects of PM2.5 Concentrations and Relative Humidity on Atmospheric Visibility in Beijing](https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2018JD029269), <br> [Effects of urban river width on the temperature and humidity of nearby green belts in summer](https://pubmed.ncbi.nlm.nih.gov/22720611/), <br> [Influence of different factors on relative air humidity in Zaragoza, Spain](https://www.frontiersin.org/articles/10.3389/feart.2015.00010/full). --- class: center, middle # Thanks! Slides created via the R package [**xaringan**](https://github.com/yihui/xaringan). The R packages we used: [**tidyverse**](https://doi.org/10.21105/joss.01686), [**lubridate**](https://www.jstatsoft.org/v40/i03/), [**leaflet**](https://CRAN.R-project.org/package=leaflet), [**kableExtra**](https://CRAN.R-project.org/package=kableExtra), [**visdat**](http://dx.doi.org/10.21105/joss.00355). Data is downloaded from: <br> [City of Melbourne-Microclimate Sensor Locations](https://data.melbourne.vic.gov.au/Environment/Microclimate-Sensor-Locations/irqv-hjr4), <br> [City of Melbourne-Microclimate-Sensor-Readings](https://data.melbourne.vic.gov.au/Environment/Microclimate-Sensor-Readings/u4vh-84j8) Other references: <br> [Environmental Protection Agency-Lesson 3: Humidity](https://www.epa.gov/mold/mold-course-chapter-2), <br> [Humidity Check-What Is a Comfortable Humidity Level Outside?](https://humiditycheck.com/comfortable-humidity-level-outside), <br> [The Effects of PM2.5 Concentrations and Relative Humidity on Atmospheric Visibility in Beijing](https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2018JD029269), <br> [Effects of urban river width on the temperature and humidity of nearby green belts in summer](https://pubmed.ncbi.nlm.nih.gov/22720611/), <br> [Influence of different factors on relative air humidity in Zaragoza, Spain](https://www.frontiersin.org/articles/10.3389/feart.2015.00010/full).